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Discrete Dislocation Plasticity Approach to Fast Moving Dislocations

Published online by Cambridge University Press:  15 February 2011

A. Roos ,
E. Metselaar ,
J.Th.M. De Hosson  and
E. van der Giessen
A. Roos
Affiliation:
Department of Applied Physics, Materials science Centre and Netherlands Institute of Metals Research, Universit y of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
E. Metselaar
Affiliation:
Department of Applied Physics, Materials science Centre and Netherlands Institute of Metals Research, Universit y of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
J.Th.M. De Hosson
Affiliation:
Department of Applied Physics, Materials science Centre and Netherlands Institute of Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands E-mail:hossonj@phys.rug.nl
E. van der Giessen
Affiliation:
Faculty of Mechanical Engineering, Delft University of Technology, Delft, The Netherlands
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Abstract

This paper concentrates on application of the so-called Discrete Dislocation Plasticity to high strain rate deformations. In particular the question is addressed if the DDP approach may capture the specific processes taking place at high strain rates. In particular the paper reports on tests of the validity of some approximations and provides some sample runs to show the applicability of the method. In assessing the results, one has to keep in mind two underpinning aspects: (1) the model is two-dimensional and (2) the results hold only in the regime where linear isotropic elasticity is valid. It was concluded that accelerations can not be neglected at very high strain rate deformations, both for the conventional and the relativistic case.

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References

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